/Engine/Source/Developer/TraceInsights/Public/Insights/Common/PaintUtils.h
void DrawSpline ( uint32 InLayer, const float X, const float Y, const FVector2D & InStart, const FVector2D & InStartDir, const FVector2D & InEnd, const FVector2D & InEndDir, float InThickness, const [FLinearColor](API\Runtime\Core\Math\FLinearColor) & InTint ) const